I've been wanting this Player Card for the longest time,
and last night I thought I unlocked it,but apparently I didn't.
I only needed everything from Super Killer,up to Chain Killer to unlock it,I had everything else.
I was in a match on Ground War Domination,and I got my first Chain Killer,so I figured since I never had any of the other ones,
that I would finally be done and get the Master Killer,but after the match,the only thing that I got was the Chain Killer.
I assumed that getting that one would also have given me all the other ones,right ? But I guess not,so they must all have to be done 1by1.